期刊
NANO RESEARCH
卷 11, 期 4, 页码 2256-2264出版社
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-017-1847-1
关键词
sodium-ion batteries; nanofibers; interlayer spacing; flexible
类别
资金
- National Natural Science Foundation of China [21373195, 51674228, 51622210]
- National Key Research and Development Program of China [2016YFB0100305]
- Fundamental Research Funds for the Central Universities [WK3430000004, WK2320000034]
- Collaborative Innovation Center of Suzhou Nano Science and Technology
- Youth Innovation Promotion Association CAS [2013286]
A flexible and free-standing multichannel carbon nanofiber (MCNF) film electrode was fabricated through electrospinning and carbonization. After high-temperature treatment of MCNFs in vacuum, the obtained fibers (MCNFs-V) had a dilated interlayer spacing of graphene sheets (0.398 nm) and an ultra-low specific surface area (15.3 m(2)/g). When used as an anode for sodium-ion batteries, the MCNFs-V showed a discharge plateau below 0.1 V, and sodium was intercalated into the stacked graphene sheets layers during the sodiation process. The MCNFs-V exhibited a reversible and high specific capacity of 222 mAh/g at a current density of 0.1 A/g after 100 cycles and excellent long-term cycling stability, which was superior to that of MCNFs. The improved sodium storage performance was attributed to the unique microstructure of the MCNFs-V with an enlarged interlayer spacing of graphene sheets for sodium intercalation. The MCNFs-V electrode holds great promise as an anode material for commercial sodium-ion batteries.
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